Improvement in pipe-tongs



A. mcuoliALu.

Pipe-Tongs. No, 168,160 I Patented Sept.28,l875.

N.PETER$ PHOTO-UTHOGRAPHER WASHINGTON. D C.

UNITED STATES PATENT QFFIGE.

. ALEXANDER MoDONALD, or HALIFAX, cANADA.

lMPROVEMENT IN PlPE-TONGS.

Specification forming part of Letters Patent BIO-168,166, dated September 28, 1875 application filed A August 28, 1875.

To all whom it may concern! 'Be it known that I, ALEXANDER MoDoN- ALD, of Halifax, in the county of Halifax,

Province of Nova Scotia, Dominion of Canada, have invented a new and useful Improvement in Pipe-Tongs, of which the following is a specification:

. the pivoted bars with the hooked lever and the notched lever; and in thecombination of the set-screw with the pivoted bars, the hooked .lever, and the notched lever, as hereinafter fully described.

Band C are'the levers of the tongs. The forward end of the lever B is bent into hook form, and has corrugations or teeth formed upon its concave surface. The forward end of the lever O has a V-shaped, flaring. or rounded notch formed in it, the inclined sides of which are corrugated or toothed. To the opposite sides of the forward end of the notched lever G are pivoted the forward ends of two bars, A, the rear ends of which are pivoted to the opposite sides of the hooked lever B, at some distance from its forward end. The pivoting-bolt at the rear ends of the bars A'passes through a longitudinal slot in the lever B, and its rearward movement is limited by a set-screw, D, that passes in through a screw-hole in said lever B, in line with the said slot. 1

The set-screw D enables the tongs to be adjusted to operate upon various sizes ofpipes.

By thisconstruction a great advantage of leverage is givento the tongs, so that they will grasp-the pipe or other object firmly and hold it securely.

Having thus described my invention, I claim as new and desire to secure by Letters Pat ent I 1. The combination of the pivoted bars A with the hooked lever B and the notched lever O, substantially as herein shown and described.

2. The combination of the set-screw D with J the bars A, the hooked lever B, and the notched lever C,'substantially as herein shown 

